DURANGO

Colonial letter mailed from Durango to Zacatecas on February 27, 1816.
Cover mailed from San Juan de Guadalupe to Durango on February 26, 1864.
Cover mailed from San Dimas (Dur.) to Durango. The letter contents are missing so it is not possible to pin down the exact date, but it is most likely a pre-stamp, basing it on the fact that the cancel is in red making it a "collect on delivery" letter.
Cover mailed from Muleros (Dur.) to Durango on October 28, 1850.